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add show local session command #1345

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Dec 29, 2021
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add show local session command #1345

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12 changes: 7 additions & 5 deletions docs-2.0/3.ngql-guide/7.general-query-statements/6.show/17.show-sessions.md
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# SHOW SESSIONS

`SHOW SESSIONS`语句显示所有会话信息，也可以指定会话 ID 进行查看。
登录 Nebula Graph 数据库时，会创建对应会话，用户可以查询会话信息。

## 注意事项

使用 Nebula Console 登录数据库时，会创建一个会话，操作结束执行`exit`退出登录时，客户端会调用 API `release`，释放会话并清除会话信息。
- 执行`exit`退出登录时，客户端会调用 API `release`，释放会话并清除会话信息。如果没有正常退出，且没有在配置文件 [nebula-graphd.conf](../../../5.configurations-and-logs/1.configurations/3.graph-config.md) 设置空闲会话超时时间（`session_idle_timeout_secs`），会话不会自动释放。对于未自动释放的会话，需要手动删除指定会话 (TODO: coding)。

如果没有正常退出，且没有在配置文件 [nebula-graphd.conf](../../../5.configurations-and-logs/1.configurations/3.graph-config.md) 设置空闲会话超时时间（`session_idle_timeout_secs`），会话不会自动释放。
- `SHOW SESSIONS`查询所有 Graph 服务上的会话信息。

对于未自动释放的会话，需要手动删除指定会话 (TODO: coding)。
- `SHOW LOCAL SESSIONS`从当前连接的 Graph 服务获取会话信息，不会查询其他 Graph 服务上的会话信息。

- `SHOW SESSION <Session_Id>`查询指定 Session ID 的会话信息。

## 语法

```ngql
SHOW SESSIONS;
SHOW [LOCAL] SESSIONS;
SHOW SESSION <Session_Id>;
```

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12 changes: 6 additions & 6 deletions docs-2.0/3.ngql-guide/7.general-query-statements/6.show/18.show-queries.md
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## 注意事项

- `SHOW QUERIES`从本地缓存获取当前 Session 中查询的状态，几乎没有延迟。
- `SHOW LOCAL QUERIES`从本地缓存获取当前 Session 中查询的状态，几乎没有延迟。

- `SHOW ALL QUERIES`从 Meta 服务获取所有 Session 中的查询信息。这些信息会根据参数`session_reclaim_interval_secs`定义的周期同步到 Meta 服务，因此在客户端获取到的信息可能属于上个同步周期。
- `SHOW QUERIES`从 Meta 服务获取所有 Session 中的查询信息。这些信息会根据参数`session_reclaim_interval_secs`定义的周期同步到 Meta 服务，因此在客户端获取到的信息可能属于上个同步周期。

## 语法

```ngql
SHOW [ALL] QUERIES;
SHOW [LOCAL] QUERIES;
```

## 示例

```ngql
nebula> SHOW QUERIES;
nebula> SHOW LOCAL QUERIES;
+------------------+-----------------+--------+----------------------+----------------------------+----------------+-----------+-----------------+
| SessionID | ExecutionPlanID | User | Host | StartTime | DurationInUSec | Status | Query |
+------------------+-----------------+--------+----------------------+----------------------------+----------------+-----------+-----------------+
| 1625463842921750 | 46 | "root" | ""192.168.x.x":9669" | 2021-07-05T05:44:19.502903 | 0 | "RUNNING" | "SHOW QUERIES;" |
+------------------+-----------------+--------+----------------------+----------------------------+----------------+-----------+-----------------+

nebula> SHOW ALL QUERIES;
nebula> SHOW QUERIES;
+------------------+-----------------+---------+----------------------+----------------------------+----------------+-----------+---------------------------------------------------------+
| SessionID | ExecutionPlanID | User | Host | StartTime | DurationInUSec | Status | Query |
+------------------+-----------------+---------+----------------------+----------------------------+----------------+-----------+---------------------------------------------------------+
| 1625456037718757 | 54 | "user1" | ""192.168.x.x":9669" | 2021-07-05T05:51:08.691318 | 1504502 | "RUNNING" | "MATCH p=(v:player)-[*1..4]-(v2) RETURN v2 AS Friends;" |
+------------------+-----------------+---------+----------------------+----------------------------+----------------+-----------+---------------------------------------------------------+

# 返回耗时 TOP 10 的查询。
nebula> SHOW ALL QUERIES | ORDER BY $-.DurationInUSec DESC | LIMIT 10;
nebula> SHOW QUERIES | ORDER BY $-.DurationInUSec DESC | LIMIT 10;
+------------------+-----------------+---------+----------------------+----------------------------+----------------+-----------+-------------------------------------------------------+
| SessionID | ExecutionPlanID | User | Host | StartTime | DurationInUSec | Status | Query |
+------------------+-----------------+---------+----------------------+----------------------------+----------------+-----------+-------------------------------------------------------+
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